directory.c 8.83 KB
Newer Older
1
/* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
2
3
4
5
6
/* See LICENSE for licensing information */
/* $Id$ */

#include "or.h"

7
static int directory_send_command(connection_t *conn, int command);
Roger Dingledine's avatar
Roger Dingledine committed
8
9
static int directory_handle_command(connection_t *conn);

10
11
12
13
/********* START VARIABLES **********/

extern or_options_t options; /* command-line and config-file options */

14
static char fetchstring[] = "GET / HTTP/1.0\r\n\r\n";
15
static char answerstring[] = "HTTP/1.0 200 OK\r\n\r\n";
16
17
static char the_directory[MAX_DIR_SIZE+1];
static int directorylen=0;
18
19
20

/********* END VARIABLES ************/

21
void directory_initiate_command(routerinfo_t *router, int command) {
22
23
  connection_t *conn;

24
  if(!router) { /* i guess they didn't have one in mind for me to use */
Roger Dingledine's avatar
Roger Dingledine committed
25
    log_fn(LOG_WARN,"No running dirservers known. This is really bad.");
26
    /* XXX never again will a directory fetch work. Should we exit here, or what? */
27
    return;
28
  }
29

30
31
#if 0 /* there's no problem with parallel get/posts now. whichever 'get' ends
         last is the directory. */
32
33
  if(connection_get_by_type(CONN_TYPE_DIR)) { /* there's already a dir conn running */
    log_fn(LOG_DEBUG,"Canceling connect, dir conn already active.");
34
    return;
35
  }
36
#endif
37

38
39
  if(command == DIR_CONN_STATE_CONNECTING_FETCH)
    log_fn(LOG_DEBUG,"initiating directory fetch");
40
  else
41
    log_fn(LOG_DEBUG,"initiating directory upload");
42

43
44
45
  conn = connection_new(CONN_TYPE_DIR);

  /* set up conn so it's got all the data we need to remember */
Roger Dingledine's avatar
Roger Dingledine committed
46
47
  conn->addr = router->addr;
  conn->port = router->dir_port;
48
49
  conn->address = tor_strdup(router->address);
  conn->nickname = tor_strdup(router->nickname);
50
51
  if (router->identity_pkey)
    conn->identity_pkey = crypto_pk_dup_key(router->identity_pkey);
Nick Mathewson's avatar
Nick Mathewson committed
52
  else {
Roger Dingledine's avatar
Roger Dingledine committed
53
    log_fn(LOG_WARN, "No signing key known for dirserver %s; signature won't be checked", conn->address);
54
    conn->identity_pkey = NULL;
55
    /* XXX is there really any situation where router doesn't have an identity_pkey? */
Nick Mathewson's avatar
Nick Mathewson committed
56
  }
57

58
  if(connection_add(conn) < 0) { /* no space, forget it */
59
60
61
62
    connection_free(conn);
    return;
  }

63
64
  switch(connection_connect(conn, router->address, router->addr, router->dir_port)) {
    case -1:
65
      router_mark_as_down(conn->nickname); /* don't try him again */
66
      connection_remove(conn);
67
68
      connection_free(conn);
      return;
69
70
    case 0:
      connection_set_poll_socket(conn);
71
72
73
      connection_watch_events(conn, POLLIN | POLLOUT | POLLERR);
      /* writable indicates finish, readable indicates broken link,
         error indicates broken link in windowsland. */
74
      conn->state = command;
75
      return;
76
    /* case 1: fall through */
77
78
  }

79
  connection_set_poll_socket(conn);
80
  if(directory_send_command(conn, command) < 0) {
81
82
83
84
85
    connection_remove(conn);
    connection_free(conn);
  }
}

86
static int directory_send_command(connection_t *conn, int command) {
87
88
  const char *s;
  char tmp[8192];
89
90
91

  assert(conn && conn->type == CONN_TYPE_DIR);

92
  switch(command) {
93
    case DIR_CONN_STATE_CONNECTING_FETCH:
94
      connection_write_to_buf(fetchstring, strlen(fetchstring), conn);
95
      conn->state = DIR_CONN_STATE_CLIENT_SENDING_FETCH;
96
      break;
97
    case DIR_CONN_STATE_CONNECTING_UPLOAD:
98
99
      s = router_get_my_descriptor();
      if(!s) {
Roger Dingledine's avatar
Roger Dingledine committed
100
        log_fn(LOG_WARN,"Failed to get my descriptor.");
101
102
        return -1;
      }
103
104
      snprintf(tmp, sizeof(tmp), "POST / HTTP/1.0\r\nContent-Length: %d\r\n\r\n%s",
               strlen(s), s);
105
      connection_write_to_buf(tmp, strlen(tmp), conn);
106
      conn->state = DIR_CONN_STATE_CLIENT_SENDING_UPLOAD;
107
      break;
108
109
110
111
112
113
114
115
116
  }
  return 0;
}

int connection_dir_process_inbuf(connection_t *conn) {

  assert(conn && conn->type == CONN_TYPE_DIR);

  if(conn->inbuf_reached_eof) {
117
    switch(conn->state) {
118
      case DIR_CONN_STATE_CLIENT_READING_FETCH:
119
        /* kill it, but first process the_directory and learn about new routers. */
120
        switch(fetch_from_buf_http(conn->inbuf,
121
                                   NULL, 0, the_directory, MAX_DIR_SIZE)) {
122
          case -1: /* overflow */
Roger Dingledine's avatar
Roger Dingledine committed
123
            log_fn(LOG_WARN,"'fetch' response too large. Failing.");
124
125
            return -1;
          case 0:
126
            log_fn(LOG_INFO,"'fetch' response not all here, but we're at eof. Closing.");
127
128
129
            return -1;
          /* case 1, fall through */
        }
130
        /* XXX check headers, at least make sure returned 2xx */
131
        directorylen = strlen(the_directory);
132
        log_fn(LOG_INFO,"Received directory (size %d):\n%s", directorylen, the_directory);
133
        if(directorylen == 0) {
134
          log_fn(LOG_INFO,"Empty directory. Ignoring.");
135
136
          return -1;
        }
137
        if(router_get_dir_from_string(the_directory, conn->identity_pkey) < 0){
138
          log_fn(LOG_INFO,"...but parsing failed. Ignoring.");
139
        } else {
140
          log_fn(LOG_INFO,"and got an %s directory; updated routers.", 
141
              conn->identity_pkey ? "authenticated" : "unauthenticated");
142
143
144
145
146
        }
        if(options.OnionRouter) { /* connect to them all */
          router_retry_connections();
        }
        return -1;
147
      case DIR_CONN_STATE_CLIENT_READING_UPLOAD:
148
        /* XXX make sure there's a 200 OK on the buffer */
149
        log_fn(LOG_INFO,"eof while reading upload response. Finished.");
150
151
        return -1;
      default:
152
        log_fn(LOG_INFO,"conn reached eof, not reading. Closing.");
153
        return -1;
Roger Dingledine's avatar
cleanup    
Roger Dingledine committed
154
    }
155
156
  }

157
158
159
160
  if(conn->state == DIR_CONN_STATE_SERVER_COMMAND_WAIT)
    return directory_handle_command(conn);

  /* XXX for READ states, might want to make sure inbuf isn't too big */
161

162
  log_fn(LOG_DEBUG,"Got data, not eof. Leaving on inbuf.");
163
164
165
  return 0;
}

Roger Dingledine's avatar
Roger Dingledine committed
166
static int directory_handle_command(connection_t *conn) {
167
  char headers[1024];
168
  char body[50000]; /* XXX */
Roger Dingledine's avatar
Roger Dingledine committed
169
  size_t dlen;
170
  const char *cp;
171
172
173

  assert(conn && conn->type == CONN_TYPE_DIR);

174
  switch(fetch_from_buf_http(conn->inbuf,
175
                             headers, sizeof(headers), body, sizeof(body))) {
176
    case -1: /* overflow */
Roger Dingledine's avatar
Roger Dingledine committed
177
      log_fn(LOG_WARN,"input too large. Failing.");
178
179
180
181
182
      return -1;
    case 0:
      log_fn(LOG_DEBUG,"command not all here yet.");
      return 0;
    /* case 1, fall through */
183
184
  }

185
186
  log_fn(LOG_DEBUG,"headers '%s', body '%s'.",headers,body);
  if(!strncasecmp(headers,"GET",3)) {
187
    /* XXX should check url and http version */
188
    log_fn(LOG_DEBUG,"Received GET command.");
189

Roger Dingledine's avatar
Roger Dingledine committed
190
    dlen = dirserv_get_directory(&cp);
191

Roger Dingledine's avatar
Roger Dingledine committed
192
    if(dlen == 0) {
Roger Dingledine's avatar
Roger Dingledine committed
193
      log_fn(LOG_WARN,"My directory is empty. Closing.");
194
      return -1; /* XXX send some helpful http error code */
195
    }
196

197
    log_fn(LOG_DEBUG,"Dumping directory to client."); 
198
199
    connection_write_to_buf(answerstring, strlen(answerstring), conn);
    connection_write_to_buf(cp, dlen, conn);
200
201
    conn->state = DIR_CONN_STATE_SERVER_WRITING;
    return 0;
202
203
  }

204
  if(!strncasecmp(headers,"POST",4)) {
205
    /* XXX should check url and http version */
206
    log_fn(LOG_DEBUG,"Received POST command.");
207
208
    cp = body;
    if(dirserv_add_descriptor(&cp) < 0) {
Roger Dingledine's avatar
Roger Dingledine committed
209
      log_fn(LOG_WARN,"dirserv_add_descriptor() failed. Dropping.");
210
211
      return -1; /* XXX should write an http failed code */
    }
212
    dirserv_get_directory(&cp); /* rebuild and write to disk */
213
    connection_write_to_buf(answerstring, strlen(answerstring), conn);
214
215
    conn->state = DIR_CONN_STATE_SERVER_WRITING;
    return 0;
216
217
  }

Roger Dingledine's avatar
Roger Dingledine committed
218
  log_fn(LOG_WARN,"Got headers with unknown command. Closing.");
219
  return -1;
220
221
222
223
224
225
226
227
}

int connection_dir_finished_flushing(connection_t *conn) {
  int e, len=sizeof(e);

  assert(conn && conn->type == CONN_TYPE_DIR);

  switch(conn->state) {
228
229
    case DIR_CONN_STATE_CONNECTING_FETCH:
    case DIR_CONN_STATE_CONNECTING_UPLOAD:
230
      if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, (void*)&e, &len) < 0)  { /* not yet */
231
        if(!ERRNO_CONN_EINPROGRESS(errno)) {
232
          log_fn(LOG_DEBUG,"in-progress connect failed. Removing.");
233
          router_mark_as_down(conn->nickname); /* don't try him again */
234
235
236
237
238
239
240
          return -1;
        } else {
          return 0; /* no change, see if next time is better */
        }
      }
      /* the connect has finished. */

241
      log_fn(LOG_INFO,"Dir connection to router %s:%u established.",
242
243
          conn->address,conn->port);

244
      return directory_send_command(conn, conn->state);
245
246
247
    case DIR_CONN_STATE_CLIENT_SENDING_FETCH:
      log_fn(LOG_DEBUG,"client finished sending fetch command.");
      conn->state = DIR_CONN_STATE_CLIENT_READING_FETCH;
248
249
      connection_watch_events(conn, POLLIN);
      return 0;
250
251
252
    case DIR_CONN_STATE_CLIENT_SENDING_UPLOAD:
      log_fn(LOG_DEBUG,"client finished sending upload command.");
      conn->state = DIR_CONN_STATE_CLIENT_READING_UPLOAD;
253
254
      connection_watch_events(conn, POLLIN);
      return 0;
255
    case DIR_CONN_STATE_SERVER_WRITING:
256
      log_fn(LOG_INFO,"Finished writing server response. Closing.");
257
258
      return -1; /* kill it */
    default:
Roger Dingledine's avatar
Roger Dingledine committed
259
      log_fn(LOG_WARN,"BUG: called in unexpected state.");
260
      return -1;
261
262
263
264
  }
  return 0;
}

265
266
267
268
269
270
271
/*
  Local Variables:
  mode:c
  indent-tabs-mode:nil
  c-basic-offset:2
  End:
*/